Hi Teresa, The reason for this is that changing the Proportions Slider doesn’t change the size of the collage, it only changes the ratio of width to height. So although one may seem larger than the other, in fact it is just about finding a ratio which most closely fits the collage’s width to height ratio.
In this case 18 / 24 = 0.75 and 43 / 57 = 0.754… which is the closest match available.
